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Sterile; neutrino; LSND

We investigate symmetries in Dirac and Majorana mass matrices of neutrinos in a three-generation scenario. We show that if we invokeL_e +L_μ-L_τxS_2R symmetry, one combination of right-handed neutrino states remains massless which can be interpreted as a sterile neutrino. Next we consider a SU2_Lx U(1)_yx U(l)_R gauge model and show how higher-dimensional operators can induce mixing between left- and right-handed states which explains solar, atmospheric and LSND experimental results.

Biswajoy Brahmachari^{1 2} Sandhya Choubey³ Rabindra N Mohapatra⁴

1. Saha Institute of Nuclear Physics, 1/AF Bidhan Nagar, Kolkata - 700 064, India
2. Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, Trieste - 34100, Italy
3. Department of Physics and Astronomy, University of Southampton, Highfield, Southampton - SO17 1RJ, UK
4. Department of Physics and Astronomy, University of Maryland, College Park, MD - 20742, USA

Published

February 2003